As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE CAPTAIN REPORTED THAT DURING DESCENT, HAD SMOKE IN THE COCKPIT COMING FROM THE GASPER VENTS. COCKPIT CREW DONNED OXYGEN MASKS. DECLARED AN EMERGENCY. UNEVENTFUL LANDING. THE FA STATED THERE WAS A GRINDING SOUND COMING FROM WHAT WAS BELIEVED NEAR SEAT ROW 8. MAINTENANCE DISCOVERED THE NR 1 ACM HAD AN INTERNAL FAILURE.